Eva Mendesin Rehab

2/1/2008 3:00 PM PST

Eva Mendes in Rehab

TMZ has learned Eva Mendes is in Utah battling a substance abuse problem.

We're told the "Ghost Rider" star is at the famous Cirque Lodge, near Sundance. The Lodge, which treated Lindsay Lohan and other stars, is one of the most respected treatment facilities in the country.

Eva has been at Cirque for several weeks.

Her rep tells TMZ "Eva has been working hard for the past year and made a positive decision to take some much-needed time off to proactively attend to some personal issues that, while not critical, she felt deserved some outside professional support. Out of respect for Eva's privacy, we do not wish to discuss further details."